Boring-tool.



R. B. DETTE.

BORING TOOL.

APPLICATION FILED DB0. 2o, 1909.

Pateted Jan. 10, 1911.

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R. E. DETTE.

BORING TOOL. APPLIOATION FILED 1320.20, 1909.

981,392, Patented Jan. 10, 1911. Y l

jgzj- 2 SH E S-SHBET 2. i ZZ 4 Il 2 ROBERT E. EETTE, OF KNOXVLLE BRGUGH, PENNSYLVANIA.

BORING-TOOL.

Specification of Letters Patent.

Patented Jain. 10, 1911..

Application filed December 20, 1909. Serial No. 534,097.

To all whom Lt may concern:

Be it known that I, ROBERT E. DETTE, a citizen of the United States, residing` at Knoxville borough, in the county of Allegheny and State of Pennsylvania, have invented certan new and useful lmprovements in Boring-Tools, of which the following is a specification, reference being4 had therein to the accompanying drawing.

My invention consists of an improvement in boring tools and has for its object to provide a tool having a plurality of sets of cutters7 c. roughing cutters and iinishing cutters,l arranged longitudinally of its length, located at suitable intervals and adapted to operate together successively through a rough opening in metal, as the hub of a car wheel.

My improved tool is particularly designed for the purpose of rough boring and iinishing the work simultaneously by means of the several cutters, obviating the necessity of feeding the tool through the bore twice, as is now common practice with other types of boring tools in use in similar work.

rlhe tool consists generally cf a main shank portion having the laterally arranged roughing cutters and finishing cutters, and incidentally an ordinary tilleting cutter, the rough and linishing cutters being adapted 'to ready and accurate adjustment to cnt several predetermined sizes of bore, with means for accurate and minute adjustment, in the manner more fully hereinafter described.

Referring to the drawings g-Figure l is a view of the boring bar in side elevation. Fig. 2 is a view of the boring` bar at right angles to Fig. l, partly in section on the line ll. Il.v of Fig. l. Fig. 3 is a similar view, in a position corresponding to Fig. l, but partly in section on the line of Hl. Hl. of Fig. 2. Fig. 4 is an enlarged detail view of the adjusting key for the finishing cutters and its locking latch. Fig. 5 is a cross-sectional detail view on the line V. V. of Fig. 2 showing the means for adjusting the finishing cutters. Fig. 6 is a similar sectional view on the line Vl. Vl. of Fig. 2, showing the roughing cutters and the sizing plug therefor. F ig. 7 is a similar view on the line VH. Vll. of Fig. 2 showing the filleting cutter and its holding screw. Fig. S is a sectional view of the lower end of the bar similar to Fig. 2, but showing a modied construction of sizing and adjusting mechanism for the finishing cut-ters. Fig. 9 is a cross sectional view on the line 1X. 1X. of Fig. S. Fig. 'l0 is a vertical sectional view on the line X. X. of Fig. S. Fig. ll is a detail view enlarged, of the adjusting screw for the finishing cutters of Fig. 2. Figs. l2 and 13 are detail views of one of the adjustable bushings with its stem extension and the sizing block as used therewith. Fig 14C is a detail view of said sizing block. Fig. l5 is a similar view of the sizing plug for the roughing cutters.

In the drawings, 2 represents the main body portion of the tool which is generally cylindrical in form and provided at its upper portion with a reduced tapered extremity 3 for insertion in the actuating head of the boring mill or machine.

At its lower portion the bar is provided with a pair of laterally arranged roughing cutters 4t, and finishing cutters 5. 5. arranged midway between said roughing cntters, laterally of the bar 2 in suitable receiving cavities or recesses therein, the finishing cutters preferably over-lapping downwardly across the working peripheral area of the roughing cutters 4.

G represents a finishing tilleting cutter located in a suitable socketat any desired position beyond the finishing cutter, adjust-- able outwardly by temper screw 'T and se cured in position by a set screw 8, said tilleting cutter however, forming no part of the present invention.

The construction of the roughing cutters is such as to permit of positive adjustment to make a rough cnt of any predetermined or desired dimension readily and quickly for which purpose I employ a sizing plug 9 which is inserted and adjusted by the hand of the operator transversely of the bar within a cylindrical opening l0 therein.

The sizing plug 9 has a main cylindrical body portion composed of short end cylinders ll and intervening narrow collars or flanges l2 of the same diameter, all of which bear within the transverse cylindrical opening lO.

The body portion of the sizing plug between its end cylindrical portions ll and collars l2 and the central body portion between said collars is made rectangular as shown, providing sets of bearing faces 13, lil and l5. cach set comprising four rectangularly arranged faces, comprising two Cri bearings7 of two different widths apart. 'that is to say, the opposite faces 13 are of a predetermined distance apart and equally from the center, while the intervening faces are of a different distance apart and from the center. rlhe sets of faces lll and are similarly arranged by which construction l secure three successive four-sided sets of faces of increasing dimensions as to width comprising altogether six independentsets of faces. By registering any one of the set of faces z'. c. opposite sides, with the bach ends of the roughing cutters et, for instance the closest faces of the set 15, the roughing cutters may be set inwardly te their closest position for making a minimum cut.

By rotating the sizing block one fourth rotation the intervening or adjacent faces are brought into bearing position, thus locat-ing the roughing cutters outwardly to the next desired size. By shifting the siz ing plug longitudinally the next set of faces lll are brought into register with the ends of the roughing cutters, said faces lt operating in the same way to successively adjust the roughing cutters for increasing diameters of cuts, the third set of faces 13 being adjusted in the same way. By this means l secure altogether six diti'erent adjustments by varying the location of the sizing plug, c. by pulling it out, leaving in center, or pushing it in, giving three different sizes; or by turning the sizing plug one fourth way around and then similarly locating it, giving three additioi'ial sizes.

As indicated in Fig. l5, the end of the sizing plug is marked appropriately so that by arranging the plug whereby the reading will aline with the direction of the roughing cutters and locating the opposite bearing faces 13, lei or l5 in register with the cutters, the desired diameter of the roughing cut is readily determined. The roughing cutters, after being thus located with relation to the sizing plug and set inwardly thcreagainst by their inner ends, are then tightened in position by means of set screws 16 and a transverse bearing bar 1T engaging the underside of both cutter.I Lt, as shown in Fig. l0.

ln the construction shown in sheet l of the drawings the iinishing cutters 5 are inserted and held by set screws in the receiv ing slots in the ends of cylindrical cutter holders 1S, 18, which in turn are mounted in a cylindrical receiving cavity 19 arranged transversely of the bar 2 above cavity l0 and in alinement therewith, and transversely mid-way of the roughing cutters el.. The cutters 5 are braced by the sides 81 of suitable receiving slots.

Cutter holders 1S are centrally threaded with right and left-hand threads as indicated at 20 and are engaged by the similarly arranged threads of an adjusting screw 2l.,

senses at the middle portion of which are secured a beveled gear wheel 22 and a beveled oppositely arranged lgaicltiiig collar 2li is an adjusting gear mounted in cavity 25 in bar 2 opposite the middle portion of the cutter holder cavity ltl, and having a head 26 provided with a turning socket 2 for the reception of an adjusting key.

Q8 is a helical spring inserted in cavity and bearing outwardly againsta` collar 29 on adjusting screw 2st tor throwing it outwardly.

In using the above described construction the roughing cutter." are setto the position for making the roughing cut desired by manipulation or positioning of the sizing plug 9, as has been described, the cutters then being retained in place by set screws 1G and bar l?.

The inishing cutters are adjusted by means of the adjusting gear-toothed hey 3d which bears bachwardly against the retaining collar whereby the hey 2l is maintained in substantially central position with slight lost motion, due to clearance of the teeth of adjusting screw 2l between gear and collar 23. liy turning the adjusting screw to the right or left the cutting edges of cutters 5 may be accurately and minutely set to the desired position, either to inahe the linishing cut initially, or to take `up any wear, and will there remain, due to the holding action of the screws and gears and the retaining eili'cct oll the laleh 30. loaid latch is slidingly mounted in a receiring socket above the head of hey and bears against it as shown to retain the hey in place when lowered, allowing the hey to be removed when the latch is raised.

rl`he operation of the bar will be readily understood from the foregoing description.

Inv the construction shown in lfigs. S, Si and l0 the roughing cutters are mounted and operated in Ythe saine manner as bel'nro described. The `finishing culters n are in sorted in receiving slots in the ends of the cylindrical cutter holders 18 and are also held therein and brac-ed as are cutters 1S. For the pur-pose of adjusting the cutters 5 of this construction to the desired operating position, each holder lf3 internally threaded as indi ated at and each receives a, correspondingly threaded adjusting bushing` 3l. 'l`he edge of the head of each bushing is serrated or no ched as indicated at l2 and one of said bushings ha ving an extended stem 3G divided as at 3T for binding resiliently within a suitable receiving centrally arranged socket 5S in the other bushing Sil shown in Fig. 8. lach bushing 34- and 34; is provided with suitable turning spanner holes 38, and after adjustment is secured in its proper cutter holder 1S by a set screw 39 engaging one oil the notches 35. By this means the inner face of the esise c g3;

head of bushing S4 is set outwardlyT or inwardly with ielation to its cutter holder 18 so that when positioned in the cavity 19 of the bar, and separated by any suitable abutment, as the sizing block 40, its in fard travel to locate the cutting edges of cutters 5 to the desired position will be limited. The sizing block 40 is similar in function to the sizing block 9 for the roughing cutters, and is generally cube-like in form and dimensioned as to the distance between the opposite faces thereof so as to provide for three different sizes 2". c. of three different ypairs of oppositely arranged bearing faces of varying distances apart. The said sizing block is also provided with centrally arranged transverse openings 41 perfor-ating each face through the body of the block from side to side for clearance of the split stem 3G. The sizing block is also provided on its faces with dimension marks arranged parallel with the direction of the hole through which the split tension pin 36 is to pass (see Fig. 14) whereby the block is thus located readily for location of the finishing cutters to any pre-determined distension or fixed position. This block may bear on three of its faces (i 15/16, 7 and 7 1/16 indicating that when the block is properly placed the cutters will be located to make the cut corresponding to the dimensions indicated.

For the purpose of holding the cutters 5 in substantially central position and preventing undue movement of their holders 1S laterally while still allowing for a limited amount of floating movement, the pin 82 of a locking key 42 engages one of the openings 41 in block 40 as shown in Fig. 14. Said pin 32 is sufficiently smaller than hole 41 to allow a limited lateral. movement of cutters 18 like that of cutters 1S, to permit said cutters to properly follow the opening made by the rough cutters 4.

The key 42 is similar in construction and mounting to the key 24, but not necessarily having the turning socket, its function being merely to lock the block 40 and the assembled finishing cutters.

The advantages of the invention will be readily appreciated by all those familar with this class of tools. It permits of quick and accurate adjustment of the finishing cutters without the necessity of calipering or other measuring operations. the finishing cutters of both constructions having a sliding fit by their holders 18 or 18 in the socket of the boring bar7 and being capable of a slight floating movement toward one side or the other to allow the cutters to maintain proper working position through the work independent of the chatter or vibration of the piece being operated upon due to the action of the roughing cutters.

The use of the sizing plug or block with its identifying dimension marks not only facilitates the easy and quick adjustment of the cutters` but insuresl accuracy and the avoidance of mistakes.

The mounting of the finishing' cutters mid- 'ay between the roughing cutters with their cutting edges or corners stepped slightly back longitudinally from the path of the roughing cutters edges or corners provides for one practically continuous operation that the hole is bored and finished by one passage of the tool through the work.

he constructioii, design, or arrangement of the parts may be changed or varied b v the skilled mechanic, provided such changes come within the scope of the following claims.

lVhat l claim is 1. A boring tool having a pair of fixed roughing cutters. a pair of finishing cutter holders located between and rearward of said roughing cutters and adjustable independently thereofj finishing cutters secured in said independent holders and extending into the path of the fixed roughing cutters. and means for adjusting said holders and finishing cutters and for providing a limited amount of floating adjustment with relation to the fixed roughing cutters.

Q. A boring tool having a pair of finishing cutters, and gearing for adjusting said finishing cutters laterally, said gearing having a` slight lost motion to permit of a limited movement of the finishing cutters together.

8. The combination with the laterally apertured bar, of a pair of finishing cutters7 a screiT adapted to advance or retract the finishing cutters together and provided with a gear wheel, and an adjusting device having a toothed wheel engaging said gear.

4. A boring bar having a pair of transversely arranged slidingly mounted cutter holders provided with cuttersyscrew mechanism for adjusting said holders and cutters laterally. and means located between the holders for adjustment thereof and for allowing a slight lost motion and corresponding limited movement of the holders and cutters toget-her.

5. In a boring bar, the combination with a laterally apertured bar, of oppositcly arranged cutters, and holders therefor. a screw engaging said holders', and means laterally disposed between the holders for actuating said screw to expand or contract the cutters.

(3. ln a boring bar, the combination with a laterally apertured bar, of oppositely arranged cutters, and threaded holders therefor, a screw engaging said holders having a beveled gear and a collar, and an adjusting key having a bevel gear terminal engaging said bevel gear.

7. In a boring bar, the combination with a laterally apertured bar, of oppositcly arranged cutters and threaded holders therefor, a screw engaging said holders having a beveled ,e'ear and a collar, an adjusting key mechanism for adjusting said holders and cutters laterally, and means incorporated with the holders and bar, providingI a limited movement of the holders and cutters together with relation to the fixed roughing Cutters.

In testimony whereof affix my signature in presence ot' two witnesses.

ROBERT E. DETTE. lV-'itnesses r f O. M. CLARKE, Crus. S. Lnrnnr. 

